Case of a higher risk of infection in the community. Temporal evolution of the median number of infectious individuals, for the targeted class and targeted grade closure strategies with a closure-triggering threshold of 3 infectious individuals and a closure duration of 144 hours (6 days), compared with the scenario without closure and the whole school closure strategy with a closure duration of 144 hours. Here β=3.5·10−4
−1, 1/μ=2 days, 1/γ=4 days, p
=1/3. Only realizations with attack rate (AR) larger than 10% are taken into account.